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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a51788c8b3cee4cfa27a92285258c02f0bee17bdb677d0395183f1c88bb6a101' 
  AND token = 'Z91QK0axJ+mbCbgwenxfPN3v/CpU51sXzoonMNMbqTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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