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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c1bfc9d2e52b55a613d177218e2af444f544e5f9636c752af839395f6e52e21' 
  AND token = '5b/T8rKRRV3xlpGz4Mr/aVH2WGopRZSeGxaGClvn5fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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