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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6b2ab7cfaf7394a2de867de02c6e7811b2e20338f3575fc1c251aa52f6110ee' 
  AND token = '7CsJ2i/fDKdRDBJeXAffklzra4f/diM9HBVHreEyhow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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