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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c807232ac6dcd5ee56c751c548fb1a5d98768a16ad80746578b7dd73729c53a' 
  AND token = 'CoQK0dG5U1UTnfJGTE2Z8YsbdtK2E5e39615O1txm9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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