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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb799d8b0da1145f2f8fa60b8869097529142d77de16b8ed0b5a78ce38a4a9a' 
  AND token = 'OT0qq7A8N/HmtwAdjGzYtOl8g2nc54St39cCXnB1hdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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