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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb6957c89e9252fcc2d0c15309e5bc3ad71f5f7c9d09bbaad4cb0e873e87f09d' 
  AND token = 'JLnnMVd5L6faejZyg8aRaWHVMPSdjxIkrOEMpCHiCK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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