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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d788fe0363be6c64e44ee966b03ab0251f36798ee6a6e99c209f3c5dd40192' 
  AND token = 'B2IuAId3uPxIFYxFUpfdBW02EXyqMZu5frTuI9Fs6Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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