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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d16c32c1f1e912f3549e14b41fc691faf031404a3476ece954a89c68a95618e' 
  AND token = 'ELfiz/vPiBm1Y8h0c+tuZFOIrJ5feXnV/22+XLwdBlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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