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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ab26211a7ad53aef433b9c9a820eeb4df9004cef6e2a3848d0a59d7053feaf4' 
  AND token = '8lYtNbE5Xc+GuuvXYACjkwPeKhkKa1UBjNm9Ba0TREM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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