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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '358e2bc19c48efdbb342fc256bca97c146e86743c60910ab8dcce4ef76453e7f' 
  AND token = 'BnfH289K+vkMotCexxL6MtKk+2QRji7OfUYa3wUiejQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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