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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd94bd77e9badf8b907f90059df121a84e0070000ee8c34f5ad1bb7db2066cec0' 
  AND token = 'fzUc6o4LwBSGNIjCJZMS/o51JmWAeWADx9Ce3YBnvc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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