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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf3ff3c0f0a99fb31647e5664aa6d3c9f5252a8e0416789dce18bede15dabba7' 
  AND token = 'ECi9Bgunh6gPaATLA1yA2794jlnpc4j1UO0F1f3wNu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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