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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b2169b3e45362a7d4cd32a3223fbc0a33ab7f0268eb2d655a2ee7dacb6fd16' 
  AND token = '6zcpjipvFRuMFzmq4m63iwkGSQCIyiqsMsZOylVaO8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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