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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86889a0da9f73934450521be78ea35a8b1cb95f2f31bc1f28c052afc42f0a2e8' 
  AND token = 'uELTEd8WE+4fNZu3BOuFo+55nVkxQaZqwtwHghrmRvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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