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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74bd6b255778ec21ff5e5ad6235d23ebcfeea9e50d0b0ba1a1ffc32e595bfdc' 
  AND token = '0UkeLXi+WPLhpYaAObWLtT73ixla5HXomY4kIIIJJfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}