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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8b707113b5db5885f763080fe85e1deee7573a7a12f1c8b1835540e581a3ab5' 
  AND token = 'kfR/puHlgyIag/M/Mkl64lmof2/+r4ot9CxcMtsa5ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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