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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f910982b3a9ed264c2d556dd6d383e39da778875a3c6638a8852ddb16ffc9de4' 
  AND token = 'rEXz+a24/EeSU5if+1BCOCqgUPTOUGcaAAml6x2nAaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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