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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ec9010273b73fab1339ee86c00237c065ede56673668de8b557e39e8222f35e' 
  AND token = 'iJzXdM7yoEdfpqgumqxBcHg/OrACHaGJMPfBP3pl3qU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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