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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7c6532b99bc4edcf6e7a6e76e40a4059a368fbe63208924ff283dc3983cd3f' 
  AND token = 'TLCaOsV0x1xgZubP6q+xdP5pn3yXew1lQ7SHXPkJroY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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