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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb91630b8a73792d31658c15dcf469ee25b80b1a1970d2146876108a6371b1b2' 
  AND token = 'XuY4PJe5GC5ab5/iV9AUc4biMGBkRoVQTfMEoq2CR98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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