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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58f7d25e17f304097afecd77c137ef67e34349f49a06b4453c8919803972214' 
  AND token = 'bCO9LdUg7IglELH8e5IulhjUu7FzEdGZwBz5fmmT0ww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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