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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '543cf7085964b7464adc328fd2e9321e1d7e100606c950744871f0c451edcb21' 
  AND token = 'pZk1u0osy5QX3lDTWGnDdcKxXMOurViRHxBOAdCVg/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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