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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '613b8117d3367e47e2d5affb2b254b18bd2905272f65e082c8a827d13b14c61a' 
  AND token = '9T3p1vfyhvs/CDxpjbTRfxjw1vzk2lk2+YAsSZb+/m4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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