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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daf11f43723f0ef331d4b92b13d3803560a0fab6e70876759e9bf75249cd0fc0' 
  AND token = '1pddpp+i+dmavxjbz94cVen3fuujyWO+bY1YqFebU7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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