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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '196ac2156a95250d816053606927b94f7e58ba0ee2b1c62a2875f5dcfb14dc2e' 
  AND token = 'aW+U5q/TrN25sM8Aund3m35kFOV1BGP30BfFlfRT1Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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