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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1927d27e91c12b555774a79c5cd223844c8b09b4777af7dc165f4f18a365ed' 
  AND token = 'ab7tbq2QV8oVPe0eJU0VBdtV6/kz3yOC2S9NuLGC0q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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