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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '886315c1f704f957948ee031a9081ea0dca0f7f275135707c3e3d1ba14318812' 
  AND token = 'aflS+Qeiy03EI3AFKK0kqM46/jOdi5hNfW6W2iktm+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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