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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a45a9e4fc88e4b819bb7d1c2c2b6c059788e6ceee8ef09419ec940f1e9162b0b' 
  AND token = 'L/SF/AR2gxYkn+6kpnMefrifXTOScR4Vw4dROduXi7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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