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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa81f6d5eb7f757319f4b3e3dcd43bf213275dc17d9dc772010c99cae1f70ca' 
  AND token = 'T8PYhR4Gc5RfvI5WFJtsg7igQrtCiThwvdX5gjiqdl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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