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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8823e7c7447cd57b49f674a9cf6bb17fd0529a86a2e0818522fb8c444c3d557' 
  AND token = '1So2TJbNjpeto4t9nTt17ZFbgOszG8Nyf/MNg3AvJXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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