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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f313f154f7f8861e3df02b494d27414dff899f91e67ffb07eae649e77ddab9c7' 
  AND token = 'OFFGdf4+vO339/rwFCWqqEIEd06G0ZEQWjiHYhhXnvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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