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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a184a2d67ab2b1dfbcbca90191fa7d1681383676d6fc41a214ac88ff4b7e4890' 
  AND token = 'cOrvJCQjC5VmIJE0F/uvth1F0t2aKZkij1AH/CQpX/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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