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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ee1d2fb0c7247b1a6f08e4ffa34eb596dedacc1d3a37cff2a4d18b54327511' 
  AND token = 'T/46MJobxhqg18XKVPskR6UJfyAHWHt15keg13YpN1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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