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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecf384c58e40327d3a78680b813f2cff3e3c58718f683ed26e7203f0f46270e9' 
  AND token = 'LFTcfjtMd/Ipc4NRNzH3ERCTV3tTBGtZ/EX2YkJblR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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