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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84497101e5405b58b87dd4e6d6f56033133ad93037b705eef8121dd1bcc61449' 
  AND token = '9jBMht43U2bJYhNyd+ddtqMFXZvVbR7MDjjH0BSqs2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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