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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '931221062da5b3224991a4e4fce94e353f436a01763b087c462ff4974e2a7d5e' 
  AND token = 'ph4Euu9gtd37gDgPoasXg/hMBgKXnfqI8WSkid2ZFno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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