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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebe4d0e504891e63957a67d0db6434894066ce41db55c3081348cdfae9fb01cf' 
  AND token = 'Wzuh4ScSIGvAmyFRNppm1dC11fEyA8WbU7OeszKmAKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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