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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a76325daca5a8de5bdb03b5d50ea99bd1273a9fecfd051ee3404b6674846feb4' 
  AND token = 'd1JgHUjXxDVLXJt4iZVpbM9D3eol7M97rSIGm1DXhBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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