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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13e81e8e87cf26e4a2df6ef5d69ff7e1def96fc2ae17c00fa5503ed5651f6bc' 
  AND token = 'sK0AcdgEnw7yCqfyIEZhG+qvkJfHb11AiEQ/iLyi5gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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