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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f96ce26ab3cb66f3b421621d02c4868ff15488377c03704c573456cd95c257e1' 
  AND token = 'in+qU58PLy9pzDEBqWg58bFfR8sDXprfblmq+rk13s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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