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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79f565536736c534bf8bb6e85ae0ccd9ba6b84e4d72ac65cb4b685e545c0b6a' 
  AND token = 'CuqiAXZW6KQLZs+Sh9XYWWaw3+HivTrBww5XkZtpp/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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