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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83bbc7f1afe90a9295be380cbb26f90e6c51d8f6ceb180857cd740e8caede37d' 
  AND token = 'Viy/VRR5M2Rawxw5EZU+o1spqTP8oK8APYRHlPmNfoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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