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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989757fe912fb0a2276d811a1dfc8234fbcab32998eecdaccec4a011e4cec32c' 
  AND token = '4vnfehtyHhRnGc2b6lfB5SBPoKt/Wh+K4M3vu/yntGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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