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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83422a1d65627b894d22891970c3233b6712d7bba8ccc064aeea7451793b364' 
  AND token = '7yafRkcTiNBW26swGTFPAK/739uNA4B4VGpMQU1qcdk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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