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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e00f0f11433d9392217a82ef8686f6a773d80e5bfc4733704c8510c0eae343' 
  AND token = 'kO5BrhqqcrBfbsNwfQZ1/G2b3r0lKDnX1Z2Dl2diePg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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