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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e64ae9a7d88ad0660defa5e9d6c70f822cd0541ee6509fe10550bc00f0d2c3d4' 
  AND token = 'PEZU1sw6KLfyOd/vZ42yjXe8+oAHGO5nTV0QQwM9R9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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