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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10dc1bb7cf2f7b902e4493fa25bc64338fcc404368639f194a614225bd68fdab' 
  AND token = '/VkwAbj2m20izlD59ZX1as2eJ3hFAjZ7ZT0zzpR22Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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