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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34103fa30e811d4f44739ae5082cd41f5f2cdac86df3a0c47d2edde0736d4ccf' 
  AND token = 'AwyWF/rgAaFgtoaK08igvA1bkCq+1s6cjDg+cnHLxfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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