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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5edb15fcbafcb9b2c7ef05e07158044c93a67e5c6fdc86e7bf3bb5e57c6b2c2a' 
  AND token = '9pDp5r5B2ef15NLuZF7hS/ddD+XTbaMBf2QCY8wYfIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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