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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4299833f3bcf362208d8a7490c3af78ac89e5af866f53d62a3e6a71fd30be05b' 
  AND token = 'SsGy+3989gde8P6H8v+Djl3BSDKi5rdK+BRilZ6jws4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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