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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aa2274955ba736cb896e110f863cc40f33d095378f7cf6d570fdeb9487adf5e' 
  AND token = '+qU8osvbtEvzZuYXCDchlYl48Kc6GPbfui6Myc0z+SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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