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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62cbc99a4a75fa516bc573f437968752d283d9259e758a9db6ff2275c3d5fb0' 
  AND token = 'hlhVQCCt4fRi9AXxsZ691m1ZxX14Icm7eo1zkI7/yrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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