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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4461bed7d36c78b5d62d93848afba8468c04cacb2b1e27cc7d9aba0c0eb58c' 
  AND token = 'uyPmL+ok+GbLqdVkZiqvWRlU3WWZVkwcDIaumCnNQkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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