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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83efb87e77d1012538efc344b1bfc62f571b8805ede1b499e2899099b483779c' 
  AND token = '8xHteY+BnsO/+xtuYTKMPjC9q6+j4tVMZcfl7+u+5f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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