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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4702859f87bdec8fb7b5572fc4db8b3bca8baa943db544b10de72a54674a1358' 
  AND token = '7OhEdeOM4PYC2CZZNAw6Gwsuvgq4kmdfErBIIFFsq7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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