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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1d355ff7d9203c76302221da0a73daef66c4396dc7056c0836cf734c26dac5e' 
  AND token = 'H1uHKM5OZd53S9xWy8Qm+ZrXSEYibVv8bYojLqpjqeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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