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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37f7f9c026dde06d260b1ea5ff9f22ca84a2dfd7afed5ea3a8cf4a99289ec5fd' 
  AND token = 'cNTlUqgtwFDkXrVzgvQVG9cXyENWyfUEsqaEfmdP+Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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