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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fd93bb07602b2db1bf4c5334a3bb7d35be2710ec7615406c69d5fc796cd52b' 
  AND token = 'S1+V11FFiavHHtTmBEGXmyQd2D/BBQufT/pE2iMPuvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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