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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5f4412a8903f72dc9eb215266a0b0afa363c6550750a78591d14ba5e508e909' 
  AND token = '9RmiDgNLiO4eXBGjC67RUxOw4NOdgTrU+rUL07IvGmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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