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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3589c8b68ad1a37db05f5f3b43525563bd74f6bb5d8be098733918395aa6840' 
  AND token = 'Z2W4R624hXaLTMTXVHrfKda5EWZI6NFEt27SBx4798M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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