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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e16ea05e441846cda2ea680c974ba44dc14e7bfe6cfc4b8abf24305da0a28dba' 
  AND token = 'mj1j+kAg41i4QZQQln1+7f5ueChNnikI+Y/E8ZzYXQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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