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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c660e5df01dd435552c339b0e0826b444e5fd90afd05153953404080e3c1649a' 
  AND token = 'EFeTrsGdu8xkR7kfpd2SzoE+x4EN3QVXl7On69r6xd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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